Toyota Egypt Dealer / bad customer service

After 3 times of the same complaint from the brake system. And every time they told me " dust in the brake system" and finally told me " heating wax", after I wrote complaint on the website then I take appointment, I went on time but they told me you have to wait until finding free place in the maintenance hall...
I wait 5 hours for fixing car after that the car was in a bad condition ( dirty and many scratches on the paint) and they told me " it is not our problem"
I feeled angry from this dealer and I want to process this scratch on the paint